Affiliation:
1. Petroleum Engineering Department, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
Abstract
Abstract
This research effort aims at addressing the Geo-mechanical aspect of hydrogen underground storage, specifically caprock integrity tests using creep deformation modelling. This study also concentrates on time and injection rate dependent processes which could lead to permanent deformation of reservoir rocks during injection and production cycles due to the cyclical pore-pressure changes. The newly developed model includes a new term that accounts for pore expansion and compaction, and was coupled to the simplified power law. The model was then verified against uniaxial laboratory data and validated by comparing it to the power law model. The idea is to simulate several injection and production cycles of vast amounts of hydrogen into a reservoir that is saturated primarily by saline formation water (aquifer) under certain conditions to assess caprock integrity. The model has been validated using the uniaxial test data provided by Wu et al.2020 and achieved good accuracy. Furthermore, the model was compared to the simplified power law with no apparent advantages. This is attributed to the low-pressure differential and hence it is expected that the model will yield better estimations when applied to high pressure differential cases.
Reference30 articles.
1. Creep mechanics;Betten,2008
2. Axial and radial permeability evolutions of compressed sandstones: end effects and shear-band induced permeability anisotropy;Dautriat;Pure and Applied Geophysics,2009
3. Compaction and subsidence;Doornhof;Oilfield Review,2006
4. Laboratory observations of permeability enhancement by fluid pressure oscillation of in situ fractured rock;Elkhoury;Journal of Geophysical Research: Solid Earth,2011
5. Impact of geological and operational conditions on underground hydrogen storage;Ershadnia;International Journal of Hydrogen Energy,2022